Issue 40

M. Mentzini, Frattura ed Integrità Strutturale, 40 (2017) 95-107; DOI: 10.3221/IGF-ESIS.40.09 101 using horizontal titanium internal bars as reinforcement and suitable cement mortar to avoid their overturning (Fig.9a). In addition the double “T” iron connectors were replaced by new titanium ones which contributes to the strength required (Fig.9b). Furthermore three supplements of new marble are created to complete the drum’s shape. Two supplements fill the gaps in the upper side of the drum and they are joined to the ancient volume only through montage reinforcement because of their balance state due to their shape (Figs.10a,b), while the third supplement was used between the two main fragments, forming a wedge. The reinforcement required for the latter one to resist shear stresses to be developed, was inserted from the drum’s lower side, after its fitting with the rest drum’s volume using cement mortar (Fig.11). In this way (easier to adjust the pieces) the holes are invisible after the drum will be placed on the column. (a) (b) Figure 9 : (a) The two main fragments of the drum are joined together using titanium bars. (b) Replacing the double “T” iron connectors by new titanium ones on the upper side of the drum. (a) (b) Figure 10 : (a) Titanium bars ware inserted from the upper side of the first supplement after its fitting with the rest volume of the drum. (b) Titanium bars were inserted from the upper side of the second supplement after its fitting with the rest volume of the drum. Figure 11 : Titanium bars were inserted from the lower side of the third supplement after its fitting with the rest volume of the drum.